The Gatling Gun was the first successful manually operated, rapid-fire gun, and we look at Dr. Richard Gatling’s multi-barreled invention, including guns used during the Spanish American war. Cheaper than Dirt offers DRT Ammunition, and Managing Editor Aaron Carter tested this innovative new ammunition that doesn’t expand until it hits soft tissue. During World War II the Germans created and fielded the word’s first “assault rifle,” the Stg44 Sturmgewehr in 7.92 Kurtz.